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milehighbu

Warning alarm - Service Required

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milehighbu

I have a 2012 22 MXZ I just purchased last March. I have only been able to use it a couple times due to all the rain we are getting in Denver. Regardless, I am getting a "Service Required" warning message every 3 minutes or so. I can turn the alarm off easily enough but it is very annoying as you can imagine. I get the following code in the inactive faults section (no faults in the active section) of Maliview.

Malibu SPN:4239 FMI:1 028FuelTrimLong

I have looked for this specific code in the Indmar diagnostics guide but don't find this exact wording. I did find the following code which suggests a bad O2 sensor.

SPN 4239 FMI 1 Adaptive Learn Bank 2 Low (Gasoline)

Can anyone provide some additional insight before I take my boat back to the dealer? It's a bit of a drive so I would love to correct it myself if possible.

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Wayne

That's the same fault I had when the plugs for the front and rear O2 sensors were swapped. Check the tags on the wire harness going to each O2 sensor. Bank 1 will be on the same side as your steering wheel (I think. I'm staring to forget things lately). Regardless you can check all 4 sensors. There are little silver or white tags on the harness marking upstream and downstream sensors for each cylinder bank. Should be easy to see once you know what to look for.

If that's not it I would suspect a bad sensor. For diagnosing that it's best for a marine tech to monitor the sensor output while driving the boat to really see what's going on.

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